Roll grinding machine



Feb: H. J. GRIFFING 2, 085% ROLL GRINDING MACHINE Filed Dec. 20, 1935 2 Sheets-Sheet l FIG. 5

HERBERT J. GR/FF/NE Feb, 15, 1938.

H. J. GRIFFING 2,1083% ROLL GRINDING MACHINE Filed Dec. 20, 1935 2 Sheets-Sheet 2 FIG.

HERBERT J. GR/FF/NE Patented Feb. 15, 1938 UNITED STATES PATENT OFFICE ROLL GRINDING MACHKNE Herbert J. Grilling, Worcester, Mass, assignor to Norton Company, Worcester, Mass, a corporation of Massachusetts [application December 20, 1935, Serial No. 55,444

14 Claims. (Cl. 51-435) This invention relates to a cylindrical grindthe usual head and rootstock (not shown) ing machine, and more particularly to a crownwhich serve to rotatably support a roll I to be ing apparatus for 3.1 011 grinding machine. nd. The r I5 ay be mounted on ceri- One of the objects of this invention is to proters,-as. is common practice in the art, or if devide a simple, thoroughly practicable roll crownsired may be mounted in journal rests as shown -5 ing attachment for a roll grinding machine. Anin the prior patent to No 1 3 dated other object is to provide a roll crowning appa- May 12, 1914, to which reference may be had for ratus for a grinding machine which is simple and the details of the support for the work.

rugged in construction and is readily adjustable A rotatable grinding wheel 20 is supported on m to vary the extent of crown produced on a roll a rotatable wheel spindle 21 which is in turn being ground. supported on a wheel slide 22. The wheel slide Another object of this invention is to provide 22 is connected by a pair of aligned studs or truna roll crowning apparatus for a grinding manions 23 arranged on pp Sides of he Whee chine, in which the wheel slide is rocked tcslide, and which are supported on a transversely ward and from the roll being ground, and a movable intermediate slide 24. The studs or 15 mechanism is provided for rocking the wheel trunnions 23 which form a pivotal connection slide in timed relation with the relative longibetween the wheel slide 22 and the intermetudinal movement between the wheel and work diate slide 24 are preferably located parallel to support. A further object is to provide a crownand directly below the axis of the grinding wheel 2:) ing attachment in which the backlash in the and its supporting wheel spindle. The interdriving mechanism is eliminated so that the relamediate slide 26 is arranged t0 Sl e transversely tive approaching movement between the wheel on the base .40 on a pair of spaced slideways and the work piece to produce the desired crown (only one of which has been shown). The inis accurately controlled as the wheel and work termediate slide 24 is arranged to be moved transrnove relatively in traversing in each direction. versely relative to the base it by means of a 25 Other objects will be in part obvious and in part suitable wheel feeding mechanism. This mechpointed out hereinafter. anism may be of any of the well-known types, This invention accordingly consists in the ieasuch as, for example, that shown in the prior tures of construction, combinations of elements, U. S. Patent to Norton No. 762,838 dated June and arrangements of-parts, as will be exemplified 14, 1904. This mechanism may co p s a half 30 in the structure to be hereinafter described, and nut 28 depending from the intermediate slide 24. the scope of the application 01 which will be The half nut 23 mates with a rotatable feed indicated in the following claims. screw '29 which is journaled in bearings (not In the accompanying drawings, in which is shown) in the base ill. The front end of the shown one or" various possible embodiments of feed screw 2., is provided with a gear 30 which the mechanical features of this invention, meshes with a gear 3i mounted on the rear end Fig. l is a cross sectional view through a of a rotatable shaft 32. The shaft 32 is rogrinding machine, showing the improved roll tatably supported in the base Ill and is provided crowning apparatus having parts broken away to on its front end with a gear 33 meshing with a more clearly show the operation of the mechagear 3 mounted on arotatable shaft 35,the outer nism; end of which supports a manually operable hand Fig. 2 is a horizontal sectional view, taken apwheel 35. By rotating the hand wheel 39, a proximately 0n line of rotary motion is transmitted to the gears above Fig. 3 is a fragmentary sectional view, on an described to rotate the cross feed screw 29 which a: enlarged scale, taken approximately on the line serves to cause an endwise movement of the half 3-3 of F g. a d nut 28 to feed the intermediate slide 24 and the Fig. l shows a modification of the construcwheel slide 22 either toward or from the work tion shown in Fig. 1. piece IS.

A cylindrical grinding machine of the roll In the grinding of cylindrical rolls for a, rollgrinding type has been illustrated in the drav ing mill, it is frequently necessary to produce a ings, ccmprising a base it which supports a lonroll which is not a true cylinder, but which is progitudinally movable work supporting table H on vided with a cylindrical surface which is crowned a fiat way l2 and a V-way 53 for a longitudinal either concave or convex to a deflection curve movement relative to the base it. The longior otherwise, according to the requirements of the tudina y fi procable table l l is provided with rolling mill. In the machine as illustrated in the 55 drawings, the form or crown on the roll is produced by rocking the wheel slide 22 about its pivot 23 and relative to the transverse slide 24 as the roll i5 and wheel 20 are reciprocated longitudinally relative to each other.

In the construction illustrated in the drawings, the Work supporting table l l is reciprocatecl longitudinally relative to the base If; and the grinding wheel 23 to traverse the roll being ground past the operative face of the grinding wheel 29. The table ii is provided with a depending rack bar 40 which is engaged by a manual or power traverse mechanism, such as that shown in the prior Norton Patent No. 762,838 dated June 14, 1904. This mechanism is not considered part of the present invention and consequently has not been illustrated. This mechanism is a conventional, well-known mechanism for reciprocating the work table and it is, therefore, believed unnecessary to illustrate such a mechanism in detail in the present case. Reference may be had to the prior patent above-mentioned for details of disclosure.

In order to produce a predetermined rocking motion of the wheel slide 22 to rock the wheel 26 toward and from the axis of the roll l5, it is desirable to provide a mechanism to time the rocking motion of the wheel with the longitudinal relative reciprocation between the wheel 2%! and the roll I5. This is preferably accomplished by providing a gear which meshes with the table driving rack 49 on the under side of the table II. The gear 45 is mounted on a rotatable shaft 46 which is journaled in bearings in the base IQ of the machine. The rear end of the shaft 46 is provided with a gear M meshing with a gear 48 mounted on a rotatable shaft 49. The shaft 49 also carries a gear 50 which meshes with a gear 5! mounted on a rotatable shaft 52. The shaft 49 and the gears 48 and 50 carried thereby are supported on a swinging arm 53 which is supported to rotate on the shaft 46. This permits the gear 5| to be changed when desired and the gear 50 to be swung into proper mesh with the gear 5| and locked in mesh therewith by a clamping screw 54 which passes through the bracket 53 and is threaded into a portion of the base it. The shaft 52 is preferably formed integral with a splined shaft 55 which passes through a correspondingly shaped aperture within a worm 56 which is rotatably supported within a gear casing 57. The gear casing 51 is rigidly fixed to the transversely movable slide 24. The worm 55 meshes with a worm gear 60 which is mounted on a transverse shaft 5! journaled in bearings (not shown) within the gear casing 5?. The shaft 6! supports a rotatable cam 62 which is arranged to engage a follower roller 64 which is rotatably supported on a stud 65. The stud 55 is supported on the pivotally mounted wheel slide 22. From the foregoing description, it will be readily apparent that when the table i I is reciprocated longitudinally on the base ill, the rack bar 43 serves to rotate gear 45, the shaft 55, the gear 4i, the gear 48, the gear 50, the gear 5|, the worm 55, the worm gear 60, to rotate the cam 22 which serves through the roller 64 to rock the wheel slide 22 about its pivot 23 to cause the periphery of the wheel to move toward or from the axis of the roll l5 being ground.

By changing the gear 52 or interchanging the gears 41 and 48, the extent of rotation of the cam 62 may be varied for a given length of reciprocable movement of the table I i, which serves to vary the extent of rocking of the wheel 20 toward and from the work axis and thereby to vary the crown produced upon the roll being ground.

The change gears above described serve to change the crown produced on the roll being ground.

The change produced by the changing of gears, however, does not readily permit slight variations in the crown but it has been necessary in the past with such mechanisms to provide a different cam to provide the desired changes in extent of crown produced. To facilitate a fine adjustment of the rocking movement of the wheel slide 22 to vary the extent of crown produced on the roll 25, a readily adjustable means is provided to permit a quick adjustment of the extent of rock ing movement without the necessity of changing the change gears or the cam. As illustrated in the drawings, the follower roller 64 is supported on. the stud 65 which is preferably supported on the end of a lever ill. of the lever If! is anchored against longitudinal movement by means of a stud ll which is supported in bearings 12 and 13 which are fixed to the intermediate slide 24. A bushing 14 of square and is arranged to fit therewithin an elongated aperture formed in the lever H! and is held in place therein by means of an end cap 16. The stud H and the bushing 74 are held in a fixed position relative to the intermediate slide 24 and :3

are arranged so that the lever 7&3 may be moved vertically due to the aperture '55 within the lever. A roller is mounted on a stud 3| which is supported on the lever Ill and the roller 38 is arranged to contact with a projection 82 of the wheel slide 22.

In order to modify the action of the lever iii in transmitting the motion of the cam 62 to vary the rocking movement of the grinding wheel 20 toward and from the axis of the roll !5, it is desirable to provide means for adjusting the lever arms so that the motion transmitted by the cam 62 may be varied from the maximum throw of the cam 62 to zero. This is preferably accomplished by providing a pair of adjustable ball bearing rollers 85 and 86 (Fig. 3) which are mounted on oppositely projecting trunnions 8'! and 88. The rollers 85 and 86 bear against and roll on a surface 89 on the transversely movable intermediate slide 24. are preferably formed integral with a nut 90 which mates with a rotatable adjusting screw 9! which is supported in a bearing 92 on the intermediate slide 24. The end of the screw BI is provided with a beveled gear 93 meshing with a bevel gear 94 which is provided with an outwardly extending rotatable shaft 95 by which the screw 9| may be rotated. In order to facilitate adjustment of the rollers 85 and 36, a second pair of The inner end cross section is mounted on the stud H The trunnions ill and 88 anti-friction rollers 95 and 98 are mounted on 1" the trunnions 8'! and 83 and are arranged to engage the under surface 97 of the lever 16. By ad justing the position of the nut 99 by turning the screw 9|, the lever arm between the trunnion 87 and the stud Bl may be varied to adjust the extent of the throw of cam 62, and thereby vary by minute increments the extent of crown produced on the roll l5.

In the position of the parts as illustrated in Fig. 1, the distance between the center of the stud 85 and the stud 8| is equal to the distance between the stud 8| and the studB'l so that when the cam is rotated, upward motion of the roll 64 serves to rock the lever l0 about the surface of the rollers 85 and 86 as a pivot, so that the roller 75 8|] is raised or lowered to transmit a corresponding movement to the pivotedwheel slidet'22. .If

desired, to reduce the extent of crown, the shaft 95 may be rotated'to turn the screw 9| andadjust the nut '90 toward the-right, as viewed in Fig. 1, so that the stud 81 approaches the stud 8 thereby shortening. the lever .arm distance -betweenthe'studs 80 and 8|. The extent'o-f rocking motion of the 'wheelmay be varied from the maximum, as'shown inthe position'of the parts 1 illustratedgin Fig. 1, to zeroby adjusting-the position of. the rollers .85 and BBw-longitudinallyon the surface-89 by rotation ofscrew 9i. If the rollers 85 and'86 are moved'so that the :axis of 11 thestud BIis in a'vertical plane with the axis of :thestud 8|, then any :motion transmitted by the cam to'roller'ii lserves-merely to rock the. lever .Hi on'the stud 8i as a pivot: andxtransimits no rocking motion: to the wheel s2il andwould serve Fig. 4 in which thefollower roller 64 is mounted on the stud 65 on-the outerend of a lever I00 which is pivotally mountedon a'stud Hll fixed 1 1 tween the grinding wheel and work support, a

in a depending projection 1.02. ofuthe. pivotally mounted wheel support 22. 'An-adjustable fulcrum roller I03 is arranged-to engage-the under side of the opposite end of thelever 400. 1 The 1 fulcrum roller I03 is mounted on a: stud 104 so rollers which are arranged. to engage the surface 89 on the transversely zmovableislidefl l, and a pair of anti-frictionrollers of'smaller diameter which are mounted'on the Stlldll04 are arranged to. engage the .under surface: 1912ofthe lever 1.00. The. adjustment .of :the; p'osition..:of the fulcrum roller is obtained in thesame manner. The stud I04 is preferably formed as'an integral part of the nut 90 which meshes with the feed screw 9l.

The feedscrew 9| isasupported inthebearingz92.

The end of, the screw is :provided with-the bevel gear 93 meshingwith a bevel gear 94 .mounted on the end of a'shaft95. By rotationz'ofthe shaft 95, the bevel gears and thesc-reware rotated to adjustthe positionof'the'nut 9llandithereby adjust the position :of' the: fulcrum roller [03 to .vary the extent of rocking motion. transmitted to the wheel support 22.

The operation .of :the construction shown in -"Flgs. 1 and 4 is readily- .apparentfrom the foregoing disclosure. 'The roll I5 to be ground is mounted: inthe machine. The fulcrum roller is adjusted longitudinally to give the desired 'rocking motion of the wheel support to rockthe grinding wheel 29 during the relative longitudinal reciprocation of thewheel' 20 and -theroll IE to produce a predetermined crownon the roll being ground.

It will thus be seenthat there hassbeenprovided by this invention apparatus in. which the various objects hereinabove set forth together with many; thoroughly practicaladvantages are successfullyachieved. 2As=many possible embodiments may be'made of the above invention and as many changes might be made in the embodiment .above set forth, it is to be understood that all matter hereinabove set forth or shown in the Y accompanying drawings is to be interpreted as; 5 illustrative and not in a limiting sense.

1; A grinding machine comprising a base, rotatable grinding wheel and a rotatable work support which are movable longitudinally relative: 10 to each other, atransversely movable slide, a

- pivotally mounted support on said slide for said grinding wheel; means to move said slide to cause a relativeapproaching or receding movement between the grinding wheel and Work support, aLl5 rotatable cam on said slide which is rotated in timed relation with said longitudinal movement, afollower roller arranged toengage said cam,

and a lever to support said roller which is anchored to said slide and is arranged to engageif20 said pivotally mounted: support to rock thegrinding wheel.

. 2. A grinding machine comprising a base, a

1 rotatable grinding wheel and a rotatable work support-which are movable longitudinally rela 5 tive to'each other, a transversely movable slide, a pivotally mounted support on said slide for said grinding wheel, means to move said slide to cause a relative approaching or receding movement berotatable cam on said slide which is rotated in timed relation with said longitudinal movement, a lever to support said roller which is anchored to said slide, and a roller mounted on said lever between the 'follower'roller and the anchor which 35 bears against a portion of the pivotally mounted support to rock said grinding wheel during the longitudinalv movement between the. wheelz and work support.

3. A grinding machine comprising a base,. all-40 rotatable grinding wheel and a rotatable work support which are movable longitudinally and. transversely relative to each other, means to reciprocate. said grinding wheel and work support longitudinally relative to each other, meansaiii5 tolfeedsaid grindingwheel and work support transversely relative to each other, a pivotally mounted support for said grinding wheel, a rotatable cam which is rotated in timed relation with said longitudinal reciprocation a follower rollerp o a lever supporting said follower roller; means to anchor. said lever against longitudinal movement but permitting movement thereof, a roller mounted onsaid lever between the follower roller and the anchor which bears against a portionofi thee55 wheel support, and an adjustable roller which is carried by said slideandwhich bearsagainst the under side of said lever adjacentto the anchored end thereof to serve as a fulcrum for said lever.

4. A grinding. machine comprising abase, ai -GO rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, means to .re

ciprocate said grinding wheel and work support longitudinally relative to each other, means tot-:

feed said grinding wheel and work support transversely relative to each other, a pivotally mounted support for said grinding Wheel, arotatablecam Which is rotated in timed relation with the longitudinal reciprocation, a follower roller, a leven 'rio the wheel support and an adjustable roller which is carried by said slide and which bears against the under side of said lever adjacent to said anchor to serve as a fulcrum for said lever.

5. A grinding machine comprising a base, a rotatable grinding wheel and a rotatable work support which are movable longitudinally relative to each other, a transversely movable slide on said base to support one of said elements, means to feed said slide transversely relative to the base, a rotatable grinding wheel, a wheel support rotatably to support said grinding wheel, pivotal connections between said wheel support and said slide, said pivot being located directly below the work aXis and arranged to maintain the same relative position with relation to the wheel axis as the wheel is advanced due to wheel wear, a rotatable cam mounted on the rear end of said slide, means to rotate said cam by and in timed relation with the longitudinal movement between the grinding wheel and work support, a follower roller, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permitting a rocking movement thereof, a roller mounted on said lever between the follower roller and the anchor which bears against a portion of the wheel support, and an adjustable roller which is carried by said slide and which bears against the under side of said lever adjacent to the anchored end thereof to serve as a fulcrum for said lever.

6. A grinding machine comprising a base, a longitudinally reciprocable work table, a rotatable work support thereon, a transversely movable slide on said base, means to feed the slide transversely relative to the base, a rotatable grinding wheel, a wheel support to rotatably support said grinding wheel, pivotal connections between said wheel sup port and said slide, said pivot being located directly below the wheel axis, means to reciprocate said work table longitudinally, a rotatable cam mounted on the rear end of said slide, means to rotate said cam by and in timed relation with the table reciprocation, a follower roller, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permi ting movement thereof, a roller mounted on said lever between the follower roller and the anchor which bears against a portion of said wheel sup port, and an adjustable roller which is carried by said slide and which bears against the under side of said lever adjacent the anchored end thereof to serve as a fulcrum for said lever.

'7. A grinding machine comprising a base, a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, means to reciprocate said grinding wheel and work support longitudinally relative to each other, means to feed said grinding wheel and work support transversely relative to each other, a pivotally mounted support for the grinding wheel, a rotatable cam which is rotated by and in timed relation with said relative longitudinal reciprocation, a follower roller arranged to engage said cam, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permitting a rockingmovement thereof, a roller carried by said lever and located between the follower roller and the anchor which bears against a portion of the wheel support, and an adjustable roller which' bears against the under side of said lever adjacent the anchored end thereof to serve as a fulcrurn for said lever.

8.. A grinding machine comprising a base, a rotatable grinding Wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, means to reciprocate said grinding Wheel and Work support longitudinally relative to each other, means to feed said grinding wheel and work support transversely relative to each other, a pivotally mounted support for the grinding wheel, a rotatable cam which is rotated by and in timed relation with said relative longitudinal reciprocation, a follower roller arranged to engage said cam, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permitting vertical movement thereof, a roller carried by said lever and located between the follower roller and the anchor which bears against a portion of the wheel support, an adjustable roller which bears against the under side of said lever adjacent the anchored end thereof to serve as a fulcrum for said lever, and means to adjust the position of said roller to vary the length of the lever arm so as to adjust the extent of rocking motion transmitted by said cam to the wheel slide and vary the extent of crown produced on the work piece being ground.

9. A grinding machine comprising a base, a lorigitudinally reciprocable work table, a rotatable work support thereon, a transversely movable slide on said base, means to feed the slide transversely relative to the base, a rotatable grinding wheel, a wheel support to rotatably support said grinding wheel, pivotal connections between said wheel support and said slide, said pivot being located directly below the wheel axis, a rotatable cam mounted on the rear end of said slide, means to rotate said cam by and in timed relation with the table reciprocation, a follower roller, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permitting vertical movement thereof, a roller intermediate the follower roller and said anchor which bears against a portion of said wheel slide, and an adjustable roller which bears against the under side of said lever adjacent the anchored end to serve as a fulcrum for said lever.

10. A grinding machine comprising a base, a longitudinally reciprocable work table, a rotatable work support thereon, a transversely movable slide on said base, means to feed the slide transversely relative to the base, a rotatable grinding wheel, a wheel support to rotatably support said grinding wheel, pivotal connections between said wheel support and said slide, said pivot being located directly below the wheel axis, a rotatable cam mounted on the rear end of said slide, means to rotate said cam by and in timed relation with the table reciprocation, a follower roller, a lever supporting said follower roller, means to anchor said lever against longitudinal movement but permitting vertical movement thereof, a roller intermediate the follower roller and said anchor which bears against a portion of said wheel slide, an adjustable roller which bears against the under side of said lever adjacent the anchored end to serve as a fulcrum for said lever, and means to adjust the position of said roller to vary the length of said lever arm to adjust the extent of rocking motion transmitted by said cam to the wheel slide.

11. A crowning attachment for roll grinding machines of the type in which a rotatable work support and a rotatable grinding wheel are reciprocated longitudinally and transversely relative to each other, comprising a transversely movable slide, a wheel support for said wheel which is pivotally mounted to said slide, a rotatable cam, driving means for said cam which is operated in timed relation with the relative longitudinal reciprocatory movement, a follower roller for said cam, a lever supporting said follower roller, an anchor for said lever which is supported on said slide and arranged to hold said lever against longitudinal movement but permitting vertical movement thereof, a roller intermediate said anchor and said follower roller and supported on said lever and arranged to engage a portion of the wheel support, and a roller supported on the intermediate slide which serves as a fulcrum for said lever.

12. A crowning attachment for roll grinding machines of the type in which a rotatable work sup-port and a rotatable grinding wheel are reciprocated longitudinally and transversely relative to each other, comprising a transversely movable slide, a wheel support for said wheel which is pivotally mounted to said slide, a rotatable cam, driving means for said cam which is operated in timed relation with the relative longitudinal reciprocatory movement, a follower roller for said cam, a lever supporting said follower roller, an anchor for said lever which is supported on said slide and arranged to hold said lever against longitudinal movement but permitting vertical movement thereof, a roller intermediate said anchor and said follower roller and supported on said lever and arranged to engage a portion of the wheel support, a roller supported on said slide and arranged to engage the under side of said lever adjacent the anchored end thereof, and means to adjust the position of said roller to vary the lever arms between said roller and the intermediate roller so as to vary the extent of rocking movement of said wheel support so as to adjust the extent of crown on said work.

13. A grinding machine comprising a base, a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, means to reciprocate said grinding wheel and Work support longitudinally relative to each other, means to feed the grinding wheel and work support transversely relative to each other, a pivotally mounted support for the grinding wheel, a rotatable cam which is rotated by and in timed relation with said relative longitudinal reciprocation, a follower roller engageable with said cam, a lever supporting said follower roller at one end thereof, means to anchor said lever against endwise movement, said lever being arranged so that motion of the cam is transmitted through the lever to rock said wheel support, a fulcrum roller which is arranged to engage the opposite end of said lever, and means to adjust the position of said fulcrum roller to vary the lever arm and thereby vary the extent of rocking movement of the grinding wheel.

14. A grinding machine comprising a base, a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, means to reciprocate said grinding wheel and work support longitudinally relative to each other, means to feed the grinding wheel and work support transversely relative to each other, a pivotally mounted support for the grinding wheel, a rotatable cam which is rotated by and in timed relation with said relative longitudinal reciprocation, a follower roller engageable with said cam, a lever supporting said follower roller at one end thereof, pivotal connections between said lever and said wheel support, said lever being arranged so that motion of said cam is transmitted through the lever to rock the wheel slide, a fulcrum roller HERBERT J. GRIFFING. 

